Process for the prevention of adhesion of the charge during the activation of carbon



, Patented Aug. 9, 1927.

UNITED STATES PATENT OFFICE.

HEINZ THIENIEMANN, OF LEVERKUSEN, DUSTRIE AKTIENGESELLSCHAFT, F

GERMANY, ASSIGNOR TO I. G. FARBENIN- FRANKFORT-ON-THE-MAIN, GERMANY.

PROCESS FOR THE PREVENTION OF ADHESION OF THE CHARGE DURING THE ACTIVA- TION OLE CARBON.

No Drawing. Application filed November '7, 1925, Serial No. 67,699, and. in Germany January 13, 1925.

It is known that many carbonization processes in which the charging materials used are adhesive, pasty or lumpy, or tend to become so on heating, can be only carried out with great difliculty or not at all in a continuous manner in revolving furnaces or vertical or inclined retorts. The process-of manufacture of the so called highly active absorption or decolourizing carbons is particularly diflicult under such conditions. Quite generally speaking such manufacture has mostly been carried out by mixing some vegetable material or mixtures of such materials, such as sawdust, peat, lignite, ground bones and so on, with an impregnating agent, such as acids, salt solutions, alkalies, or even with water and then submitting the prepared materials to carbonization at appropriate temperatures. These mixtures of relatively light vegetable materials, as for example sawdust with any solution, usually produce a mass, possessing a great tendency to bake on. For this reason it is necessary to effect the carbonization usually in a hand workedfurnace or retorts or similar apparatus.

few particularly favourable circumstances has it been found possible to carry out processes of the kind in question in a revolving furnace. v The present invention eoncerns'the prevention of adhesion'and baking on of the materials of the charge and consists in subjecting the materials in question to a certain preliminary pressure, as for example by passing the mixture through a wire cutting press and thus converting the same into threads or strings, or alternatively in compressing the material in a briquetting machine or a tabloid press. This'simple pro- Only in a cedure renders possible the carrying out of 40 the carbonizing processesin revolving furnaces or in continuously fed retortsa If the material coming from the press is sprinkled with ,a little unmixed dry vegetable'material even the most adhesive mixture is capable of carbonization in a revolving furnace without the production of incrustations or the occurrence of obstructions.

A parent material can also be used of which part is already carbonized e. g. for the regeneration of decolorizing carbons.

I claim:

1. In a carbonization process wherein the; carbonaceous material is continuously moved through the carbonizing furnace throughout the period of carbonization, the method of preventing carbonaceous material of adhesive or pasty characteristics from adhering to the furnace Walls which comprises feeding such carbonaceous material to the furnace in the 00 form of compressed, molded charges.

2. In a carbonization process wherein the carbonaceous material is continuously moved through the carbonizing furnace throughout the period of carbonization, the method of preventing carbonaceous material of adhesive or pasty characteristics from adhering to the furnace Walls which comprises feeding such carbonaceous material to the furnace in the form of briquettes.

3. Process according to claim 1, in which the compressed, molded charges are sprinkled with dried vegetable material before being fed into the carbonizing furnace.

In testimony whereof I have hereunto set 75 my hand.

HEINZ THIENEMANN. 

